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Alexander Ushakov avatar image
Alexander Ushakov asked

Quattro 48/15000/200-100/100 keeps switching over to inverter operation

My current system:

1 x Quattro 48/15000/200-100/100

4 x Delta Gel Batteries GX12-200 (12V, 200 Ah)

48 x 150W Solar panels

2 x BlueSolar MPPT 150/70-Tr/MC4

Color Control GX

My problem:

Just installed and connected Quattro unit keeps switching over to inverter operation all the time even under load less than 1kW.

I had the same problem with my previous MultiPlus 48/5000/70-100 about 4 years ago. Without Solar panels it worked perfectly, but right after I connected my first solar panels and activated ESS, it started switching over to inverter mode, resulting in overloading. I have weak grid in my village – rather low transformer, so that when someone switches boiler or other heating device, voltage drops to 200V and below. That’s why I installed the stabilizer (Ortea Vega 1500-15 / 1000-20 (15kVA/10kVA – 2 operation modes), but it did no help to eliminate the problem of switching over to inverter operation. What really helped was a new firmware, which you released at that time – right after updating my Multiplus started working perfectly.

It continued before Sept 2019, when I installed the 2nd Multiplus to work in parallel, because I needed more power. But I could not stabilize their parallel work, what I described in details here: https://community.victronenergy.com/questions/46810/2-multis-in-parallel.html

Now in order to get back to normal operation, I bought Quattro 15000, thinking that it will work as good as Multiplus 5kVA in standalone mode. But it does not. I just disconnected my perfectly working Multiplus 5kVA and connected with the same wires Quattro 15kVA. And the problem returned: I have the same abnormal operation: https://youtu.be/aQsTwFqT24g

Dear Victron team,

Can you help out by releasing the next firmware for Quattro 15kVA, similar to the one you released for 5kVA devices? This really solved my issue last time?

Or can you advise me anything else?

I spent so much money and time, trying to figure out what to do and tried almost everything, except direct programming and coding, going beyond capabilities of VE Config. This could really help me, but in order to do it, I’ll have to learn how to do it properly, what will kill lots of my time, which I don’t have.

I’m deeply disappointed. Can you give me a glimpse of hope?

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Alexandra avatar image Alexandra ♦ commented ·

@Alexander Ushakov What are your Grid settings on the Quattro? Usually grid rejection is because voltages are too low/high or the frequency are out of the range set for safe connection.

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Alexander Ushakov avatar image Alexander Ushakov Alexandra ♦ commented ·

I believe, it is not the root cause and it is not the right direction. I tried different voltages and different grid code standards, but the work of Quattro or Multi with old firmware was the same – abnormal. Only new firmware helped to eliminate the problem on old Multi. Now the same has to be done with Quattro. Only this may help.

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Alexander Ushakov avatar image
Alexander Ushakov answered ·

This morning Disabling LOM detection on AC IN 2, to which I connected the in-wire from the village, completely solved the issue of constant switching Quattro over to inverter operation. It looks like it works fine now, but I cannot let myself enable “Feed excessive power in” any more, since it may cause severe damage and injure electricians, which may work with village wires after switching the mains off.

So dear Victron team, can you say anything about possible update of firmware in future to calm down Quattro under Weak AC IN condition without mandatory to disable LOM detection?

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Daniël Boekel (Victron Energy Staff) avatar image Daniël Boekel (Victron Energy Staff) ♦♦ commented ·

Hi @Alexander Ushakov

The solution is to not use a grid code and not feed-in power, feeding power to a weak grid is usually not recommended anyway, because that can further destabilize the grid.

to still get the most out of your solar panels, you could set the quattro's to disconnect AC-input when the batteries are (fully?) charged.

one big issue though: a 200Ah (48V) battery for a 15 kVA inverter is -very- small and way under advised minimum battery size.

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